Modelagem tridimensional de patrimônio arquitetônico a partir de aerofotos obtidas por drone: Praça Brasil - Belém/Pa.

Abstract

Photogrammetry is a technique widely used in activities whose purpose is the extraction of measurements of objects through photographs. This work approaches the techniques of digital photogrammetry at a short distance (also known as architectural photogrammetry) as an important tool to help the protection of architectural heritage, aiming to generate a three - dimensional model that can support conservation activities, physical conditions evaluation, publication and management in research bodies related to the preservation of historical and artistic heritage, mainly due to the constant depredations and thefts of metal sculptures that have some economic value. Three types of surveys were carried out in this project: the photogrammetric survey using a drone (RPA - Remotely Piloted Aircraft), for the planialtimetric mapping of the study area, for the construction of the three - dimensional textured digital model of the monument to the Indian - located in Brazil square, in one of the central districts of the city of Belém - PA and that portrays an important part of the history occurred during the Portuguese colonization; the geodetic survey (GNSS), to orient the images to a global geodetic system; and the topographic survey planialtimétrico, to obtain points of support of the place of study. The results obtained through the aerotriangulation quality control using the T-Student and chi-square tests were satisfactory and the 3D model, generated from the processing in Agisoft Metashape software, shows a product which may be useful in restoration cases.